Device for drawing off welts



Jan 12, 1943. r w. HEINITZ DEVICE FOR DRAWING OFF WELTS Filed Nov. 29, 1940 4 Sheets-Sheet l Jan. 12, 1943.

w. HEINITZ DEVICE FOR DRAWING OFF WELTS 4 Sheets-Sheet 2 Filed Nov. 29, 1940 Jan. 12, 1943. v w. Ham-r1 2,308,226

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/ nsyxcn FOR DRAWING OFF WEL'IS Filed Nov. 29; 1940 4' Sheets-Sheet 4 INVENTOR. 1401019141? WAY/W722,

ATTOR/VE Y Patented Jan. 12,. 1943 OFFICE DEVICE FOR DRAWING OFF TS Waldemar Helnitz, Chemnits, Ge; vested in the Allen Property Custodian 15 Claims.

The present invention relates to a device used on fiat knitting machines for drawing welts.

Hitherto the welt bars necessary for drawing oil the welts were, after transfer of the welts efiectcd either for each division individually by hand or for all divisions commonly and automatically, successively connected to the drawing oif apparatus, whereby, besides losses of time caused by the connecting operation, other losses of time occur due the unavoidable standstill of the knitting machines.

To obviate these drawbacks a device has become known already by which the connection of the welt bars to the drawing off apparatus is commonly effected. In this device drawing oil straps provided with hooks holding the welt bars are used in a manner known per se. To return the hooks into the position ready for receiving the welt bars, other straps are provided which are connected tothe hooks receiving the welt bars and cooperate with the known straps in such a manner that on winding up of the second mentioned straps the first mentioned straps are unwound or vice versa.

Hereby difficulties are encountered in so far as differences in the diameter in the winding up of the straps occur with regard to the unwinding. This leads to ifferences in the tension of the two strap arrangements which cause non-uniform drawing off of the welts.

A general draw-back of the hitherto used straps consists, moreover, therein that these straps are strongly subjected to changes due to heatand weather influences.

The above mentioned drawbacks in connection with devices for drawing ofi welts used on flat knitting machines are obviated according to the present invention by the fact that for the common connection of all welt bars to the drawing off apparatus endless chains are used which are provided each with one or more hooks for taking up the welt bars. Hereby the welt bars after reaching the fabric rollers arranged upon the corresponding shafts of the fabric rollers are .transferred to holding devices which are provided upon the fabric rollers themselves and effect the further drawing off of the welt bars.

At the ends of the fabric rollers a fixed projection and a movable lever are provided, said projection and said lever cooperating in the manner of a pair of pincers. Thi movable lever is formed as a double lever the arm of which cooperating with the fixed projection is provided with a recess for taking up the welt bar and the other arm of which is influenced by a correspondingly biased spring.

In a recess of the metal parts, arranged at both sides of the fabric rollers, guide plates provided with eyes are fixed between which a plate carrying a projection is mounted. A bolt journalled in these eyes serves asaxis of rotation for the movable double-armed lever.

According to further features of the present invention each taking .up hook of the endless chains may pivotally or swingably be arranged upon said chains. The rotatable hooks then preferably are so formed as to adapt themselves to the guide rollers of the chains. Springs fixed to the endless chains of the drawing oil apparatus are provided to return the rotatable hooks after having been swung out.

To compensate the alterations in the tension due to the needle movements a resilient compensation of the take up may be provided according to a further construction of the invention.

This resilient'compensation of the take up is obtained by providing at the ends of the fabric roller annular recesses into each of which a coiled compression spring is inserted. This coiled spring bears against a pin of the shaft of the fabric roller and against a pin of the fabric roller.

Aisecond pin fared J the shaft of the fabric roller serves as st p for the pin of the fabric roller.

Fixed upon the shaft of the fabric roller are annular members or collars respectively provided with sleeve-like extensions by which the fabric roller is easily rotatably mounted with regard to the shaft of the fabric roller. Into the annular ndtches provided at the ends of the fabric roller the pins provided at the annular members en- 88-86.

In the accompanying drawings some constructions according to the invention are shown by way of example.

In these drawings:

Fig. l is a broken away side elevation of a drawing off apparatus in section taken on the line II of Fig. 5 showing the moment in which the welt bars are gripped by the hooks of the drawing of! apparatus,

Figs. 2-4 show various positions of the fabric roller with its holding devices for the welt bars also in a section taken on the line I--I of Fig. 5; these figures showing respectively the individual members in the moment in which the welt bars are gripped by the holders arranged upon the fabric rollers, shortly after gripping of the welt gigs, and after rotation of the fabric roller about Fig. 5 is a front elevation of one end of the fabric roller partly shown in section on the line V-V of ig. 7,

Figs. 6 and 7 show detail views in section on the lines VI-VI and VII-VII of Fig. 5 respectively, for explaining the arrangement of the holding devices for the welt bars,

Fig. 8 illustrates a modified construction of a rotatably arranged hook for taking up the welt bar,

Fig. 9 shows a front elevation partly in section of the left hand end of another construction of the fabric roller,

Fig. 10 is a section through the left hand end of the fabric roller shown in Fig. 9, the individual pieces being shown separated from each other,

Fig. 11 is an elevation of the one end of the fabric roller partly in section on the line XI-XI of Fig. 9,

Fig. 12 shows an elevation of the arrangement shown in Fig. 11 illustrating the individual members in another operative position, said figure also being partially shown in section on the line XII-XI of Fig. 9, and Fig. 13 is a perspective view of a part of a fiat knitting machine, illustrating a plurality of the divisions for drawing off welts, portions being shown in section.

Upon a shaft I extending over the entire length of a knitting machine chain guide rollers 2 are arranged at the ends of each division in the plane of which rollers sprocket wheels 5 are fixed upon the fabric rollers 4 mounted upon the shaft 3. Endless chains 6 pass round the sprocket wheels I and the chain guide rollers 2. Fixed to all the chains are laterally bent ofi hooks I for taking up the welt bars 8. Holders are arranged at the fabric rollers.

According to the modification shown metal members 8 having the same diameter as the wooden fabric rollers .are provided at both sides of the latter. Fixed in recesses of these metal members 9 are guide plates I provided with eyes between which a member I2 carrying a projection II is arranged which is fixed to said guide plates III. The projections II may be rotatably mounted between the guide plates III.

In the eyes of the guide plates ID a bolt I3 is provided upon which a double-armed lever l4, I is pivoted. The lever arm I4 lying in front of the projection II is provided with a recess I6 the diameter of which corresponds to the diameter of the welt bar 8. A spring II acts upon the other To obtain shorter welts, the hooks taking up the welt bars may, as shown in Fig. 8, also be pivoted to the chain. The hooks 20 of a corresponding length are shifted upon one of the bolts of the chain and are actuated by spring 2 I. During drawing off they may correspondingly be swung and after swinging out are returned again by means of a spring into the position of rest at lever arm I5. Guide plates I8 are provided for a the welt bars. l9 designates a fabric portion of the welt.

The device described above operates as follows:

After all the welt bars 8 are placed upon the fabric portions I9 of the welt and after the bars 8 have been moved downwardly by means of a welt bar inserting device not described in detail, all the welt bars 8 are gripped together by the hooks I of the chains (Fig. 1) and are drawn off on further movement of the endless chains 6 in the direction of the arrow a. When the welt bars I approach the level or height of the fabric roller 4 the bars 8 automatically abut against the stops I I arranged in the fabric roller (Fig. 2). 0n further rotation of the fabric roller the lever arm I i engages behind the welt bar which in turn engages the recess I6 in the lever arm It and in this manner is enclosed by the projection II and the lever arm It in'the manner of a pair of pincers (Fig. 3). The welt bars are now, independent of the hooks 1, drawn on by the members II and It only (Fig. 4).

the chain. The rotatable hooks are so shaped that they adapt themselves to the chain guide rollers and bear against the chain under the action of the springs 2|.

During drawing oil of the resulting fabric portions by means of the welt bars 8 which are moved by the hooks I fixed upon the endless chains 6 in the direction towards the fabric roller 4 and are taken over by the latter in the manner described, alterations in the tension of the drawn ofi fabric portion occur in a manner known Der se due to the needle movements which alterations in the tension must be compensated for in some suitable manner. So for instance resilient members, for example springs, have been inserted in the straps of fabric rollers provided with drawing of! straps which were provided to compensate for alterations in tension.

These known fabric rollers have a drawback in so far as the resilient parts stop operation when reaching the fabric rollers. For the fabric portions then produced any compensation of tension of the needle movement is excluded so that from this point of time the total mass of all the fabric rollers including the drawing of! weights act upon the needles. Hereby substantial differences in the loop formation are caused as all the divisions are uniformly stressed in spite of the fact, that nearly each division shows differences with regard to the condition of the material, its moisture and so on.

As stated already above the present invention proposes another way to render harmless the differences in tension occurring in the resulting fabric portion during drawing of! of the welt bars, 1. e. by effecting compensation of the tension in the fabric roller itself. This is obtained by loosely and resiliently rotatably mounting the fabric roller upon its driving shaft.

Figs. 9 to 12 show the details of this arrangement according to the invention. The chain drive illustrated in Figs. 1 to 8 being omitted in these figures.

In each division annular members 22 are fixed upon the shaft I of the fabric roller by means of screws 23. The fabric rollers 4 are loosely rotatably mounted upon sleeves 24 of the annular members 22. Metal members 9 provided at both ends of the wooden fabric rollers have annular notches 25 in their front sides. In the annular members 22 pins 26 and 21 are fixed the ends of which extend into the annular notch 28. Inserted into each of the metal members 9 of the fabric rollers is a pin 28 which also extends into the annular notch 25. a A spring 28 is inserted in each notch 25 which on the one hand abuts against the pin 28 and on the other hand against the pin 28. By the pressure of the spring 29 the pin 28 is forced against the pin 21 (Fig. 11).

The operation of this device is as follows:

If the shaft I of the fabric roller is rotated in the direction of the hands of a watch, the fabric roller 4 is moved in the same direction by the pins 21 abutting the pins 28 of the metal members 9 fixed to the fabric rollers in the same manner as if the fabric-roller would be fixed to the shaft I as this is the case in the construction shown in Figs.1t0 8.

For compensating the needle movement the fabric roller a may move in the opposite direction fabric portion due to a needle movement the fabric roller may yield independently on the rotation of the shaft of the fabric roileg, The spring 22? is compressed by the pin 28 which moves away from the pin 21. If the fabric rollers} are released, the springs 29 are extended again so that the pin 2s abuts against the pin El. The shaft i of the fabric roller is not influenced hereby and, moreover, each fabric roller Q is independent of the other rollers capable to adapt itself to the corresponding compensating movements of the div sions in question. In all divisions uni form rows of loops are knitted which are maintained for all lengths of fabrics produced.

What I claim is:

i. an apparatus used on fiat knitting machines having a plurality of divisions for drawing off welts, comprising welt bars, a shaft extending over the entire length of the knitting machine, chain guide rollers mounted on said shaft one at each end of each division, a second shaft extending in parallel to said fixed mentioned shaft, fabric rollers carried by said second shaft, a sprocket wheel fixed to each end of said fabric rollers and arranged in the plane of the corresponding chain guide rollers, endless chains passed round cooperating guide' rollers and sprocket wheels, take up hooks provided at said chains, and holding devices provided on said fabric rollers, the arrangement being such that said welt bars are gripped by said take up hooks and moved towards said fabric rollers and that on reaching said fabric rollers said welt bars are transferred to said holding devices provided on said fabric rollers.

2. An apparatus used on flat knitting machines having a plurality of divisions for drawing of! welts, comprising welt bars, a shaft extending asoaaae over the entire length of the knitting machine,

chain guide rollers mounted on said shaft one at each end of each division, a second shaft EX! tending in parallel to said first mentioned shaft, resiliently rotatable fabric rollers carried by said second shaft, a sprocket wheel fixed to each end of said fabric rollers and arranged in the plane of the corresponding chain guide rollers, endless chains passed round cooperating guide rollers and sprocket wheels, take up hooks provided at said chains, and holding devices provided on said fabric rollers, the arrangement being such that said welt bars are gripped by said take up hooks and moved towards said fabric rollers and that on reaching said fabric rollers said welt bars aretransi'erred to said holding devices provided on said fabric rollers.

3. An apparatus as set forth in claim 2 inwhich a coiled spring is inserted in an annular recess provided at each end of said fabric rollers, said spring bearing against a pin carried by the shaft of the fabric roller and a pin provided at the fabric roller, a second pin carried by the shaft of the fabric roller serving as stop for said pin provided at said fabric roller.

4. An apparatus as set forth in claim 2 in which annular members provided with sleeve-like extensions are fixed upon the shaft of the fabric rollers by which the fabric rollers are easily rotatably connected to their shaft and that pins provided at said annular members engage an 5. Anapparatus as set forth in claim 1 in which at each end of each fabric roller a stationary projection and a movable lever are provided which cooperates with said stationary projection in the manner of a pair of pincers.

6. An apparatus as set forth in claim 2 in which at each end of each fabric roller a stationary projection and a movable lever are provided which cooperates with said stationary projection in the manner of a pair of pincers.

'I. An apparatus as set forth in claim 1 in which at each end of each fabric roller a stationary projection and a movable lever are provided cooperating with each other in the manner of a pair of pincers, said movable lever being formed as a double-armed lever the arm of which cooperating with said stationary projection having a recess to take up the welt bar, whereas the other arm of said double-armed lever being influenced by a correspondingly biased spring.

8. An apparatus as set forth in claim 2 in which at each end of each fabric roller a stationary projection and a movable lever are provided 00- operating with each other in the manner of a pair of pincers. said movable lever being formed as a double-armed lever the arm of which cooperating with said stationary projection having a recess to take; up the welt bar, whereas the other arm of said double-armed lever being influenced by a correspondingly biased spring.

9. An apparatus as set forth in claim 2 in which at each end of each fabric roller a stationary projection and a movable lever are provided cooperating with each other in the manner of a pair of pincers and in which guide plates provided with eyes are fixed to metal members mounted in a recess provided at both ends of the fabric rollers, a plate carrying a projection being provided between said guide plates and a bolt serving as axis for the movable double-armed lever being iournalled in the eyes of said guide plates.

10. An apparatus as set forth in claim '1 in which said take up hooks are pivoted to said endless chains.

11. An apparatus as set forth in claim 2 in which said take up hooks are pivoted to said endless chains.

12. An apparatus as set forth in claim 1 in which said take up hooks are pivoted to said endless chains and are so shaped as to adapt themselves to the guide rollers of the endless chain.

rollers.

13. An apparatus as set forth in claim 2 in which said take up hooks are pivoted to said endless chains and are so shaped as to adapt themselves to the guide rollers of the endless chains.

14. An apparatus as set forth in claim 1 in which said take up hooks are pivoted to said endless chains and are so shaped as to adapt themselves to the guide rollers of said endless chains, springs fixed to said endless chains being provided for returning said pivoted take up hooks after having been swung out.

15. An apparatuses set forth in 'claim 2 in which said take up hooks are pivoted to said endless chains and are so shaped as to adapt themselves to the guide rollers of said endless chains, springs fixed to said endless chains being provided for returning said pivoted take up hooks after having been swung out.

WOLD HEINITZ. 

